专利汇可以提供Switchhook status signaling arrangement专利检索,专利查询,专利分析的服务。并且An electronic key telephone system is disclosed in which both conventional telephone sets as well as electronic key telephone sets are served. The electronic telephone sets transmit call signaling to and receive ringing control information from a main controller over a data link independent of the speech path but the conventional telephone sets must both transmit dial pulses and receive ringing signals over the talking path. A line transformer relay is used with both sets to repeat supervision. The conventional ringing signal, however, causes the line transformer relay to generate an erroneous switchhook state signal. In order to compensate for this erroneous response without requiring the reprogramming of the main controller each time the number of conventional and electronic key telephone sets served by the system is changed, a logic circuit inhibits the return of the station''s switchhook state ascertained by the line transformer relay for a predetermined interval after each cycle of ringing and causes an on-hook signal to be returned. When ringing is tripped, the same supervision logic in the interface circuit inhibits the return of switchhook state information ascertained by the line transformer relay for an interval longer than the maximum loop-open interval that can occur during normal dialing and instead causes an off-hook signal to be returned.,下面是Switchhook status signaling arrangement专利的具体信息内容。
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